Smog fail, what’s next?

[Dammerung]

Well, it’s been a minute since I’ve been on this forum. I’ve looked through my Tapatalk app and this forum is just… missing from there, which is odd. Anyways, the state of California has determined that my vehicle was up to the smog chopping block and came out as a gross polluter. Failed CO hard, as well as NO. What’s the next step here? Anyone know the causes that are repairable? 

[cruiser54]

what year?

 

Make sure the line from throttle body to MAP sensor is perfect.

Tighten up your intake manifold bolts.

Your oxygen sensor may be bad. 

 

If your Jeep is 90 or earlier, be sure to complete Tips 1 through 5 at www.cruiser54.com. 

[gvthnks]

Leave California?   

 

Sorry, I got nothing...   but good luck with it.  

[Ωhm]

Numbers tell me your running RICH. Look for those kinds of causes and that includes the Air Filter.

[cruiser54]

20 minutes ago, gvthnks said:

Leave California?   

 

Sorry, I got nothing...   but good luck with it.  

I did that 44 years ago!!

[Gojira94]

Ohm and cruiser54 are on it- very rich. A weak O2 sensor will do some of it, and as said, exhaust leaks upstream from it will fool it into adding fuel as it will see what appears to be a lean condition. Start with eliminating leaks at the manifold as cruiser54 said, any and all vacuum lines 100% leak-free, cruiser's tips for better sensor grounds, also check throttle body gasket in tandem with the line to the MAP sensor. Check plugs/ gap replace as necessary if fouled, gap at .035." If engine temps aren't getting up where they need to be (any number of mods can make it run cooler than it should) then it'll be stuck rich. Inaccurate coolant temp signal to ECU can also cause ECU to add more fuel than it should (reads colder than actual).

 

High NOx sounds like EGR not working as well as it should. Ignition timing (over advanced) is virtually eliminated with electronic spark control. Gunked up chambers/ valves can add to high NOx.

 

When you're rich and also have high NOx, you have 2 distinct and separate issues.

[fiatslug87]

Get a Renix Engine Monitor from Nick In Time Design, this will tell you if any of the sensors are off.

[a bum with money]

14 hours ago, fiatslug87 said:

Get a Renix Engine Monitor from Nick In Time Design, this will tell you if any of the sensors are off.

what he said, well worth the money, saved me $100's of dollars. You might check your cat converter with temp sensor gun, it should be cooler temps on the back end then the front end. if their the same temp on both ends you probably need a new cat. that was how my local Midas muffler shop did, and he was correct!

 

 

PS: like the comment under the remarks: GROSS POLLUTER. that is why people are leaving Kalfornia.

[pizzaman09]

I got my first Comanche because the person who owned it had spent two years trying to get it to pass CA emissions.  I got it for a good deal and drove it to PA.  As a result of his work I ended up with a shiny new set of Banks headers and a new cat.

 

That said, everyone else here are suggesting the right things.  If all the sensors and lines are up to snuff, then it should pass.  Definitely check those intake/exhaust manifold bolts.